CN101335032B

CN101335032B - Method and apparatus determining CD types

Info

Publication number: CN101335032B
Application number: CN2008101458098A
Authority: CN
Inventors: 刘伟武
Original assignee: Sunplus Technology Co Ltd
Current assignee: Sunplus Technology Co Ltd
Priority date: 2008-08-06
Filing date: 2008-08-06
Publication date: 2011-06-15
Anticipated expiration: 2028-08-06
Also published as: CN101335032A

Abstract

The invention discloses a method for judging the categories of optical disks which comprises the steps as follows: light spots generated by a laser source are focused on the optical disk which is then rotated; a radio-frequency signal and a first signal relevant to the radio-frequency signal are generated; the parameter value of the first signal is compared with a set default; and then, according to the comparative result, that the optical disk belongs to the optical disks with high data density or the optical disks with low data density is judged. The invention also discloses another method for judging the categories of the optical disks and a device thereof. By using the method of the invention, the radio-frequency signal can be utilized to judge the optical disk to be the optical disk with high data density or the optical disk with low data density.

Description

Judge the method and apparatus of CD types

Technical field

The present invention relates to judge the CD types technology, and be particularly related to determination methods and judgment means, be applied to judge low packing density discs and high data density discs.

Background technology

Now the industry of CD-ROM drive by traditional CD-ROM drive progress to blu-ray drives.In general, traditional CD-ROM drive only can be read and write CD discs and DVD discs.That is to say that the optical read head in traditional CD-ROM drive has CD LASER Light Source and DVD LASER Light Source, and these two kinds of LASER Light Source are the long ruddiness of wavelength.Compared to traditional CD-ROM drive, blu-ray drives can the read and write data higher high data density discs of density, for example Blu-ray Disc sheet (blue ray disc) or high density DVD discs (hereinafter to be referred as HD DVD discs).That is to say that if all discs are distinguished, traditional CD discs and DVD discs are to belong to low packing density discs, and Blu-ray Disc sheet and HD DVD discs are to belong to the high data density discs.

In order to want to read and write the high data density discs, the optical read head in the blu-ray drives has CD LASER Light Source, DVD LASER Light Source and blue laser light source.And CD LASER Light Source, DVD LASER Light Source are the long ruddiness of wavelength, and the blue laser light source is the short blue light of wavelength.

The same with traditional CD-ROM drive, after discs is inserted blu-ray drives, blu-ray drives must be distinguished the kind of discs in time-limited start-up routine (start up procedure), for example be CD discs, DVD discs, Blu-ray Disc sheet, HD DVD discs.Basically, it is quite ripe with the technology of DVD discs that traditional CD-ROM drive is distinguished the CD discs, therefore, below proposes the method that packing density discs and high data density discs are hanged down in various differentiations in the prior art.

Please refer to Figure 1A and Figure 1B, Figure 1A and Figure 1B are first kind of synoptic diagram of distinguishing low packing density discs and high data density discs in the prior art.This method is disclosed in the file that U.S. Patent Publication No. is US2006/0104176.This method is to utilize the data Layer of discs (data layer) and the distance on surface (surface) to judge the kind of discs.By Figure 1A as can be known, the thickness of Blu-ray Disc sheet is 1.2mm, and the distance on data Layer 13 and surface 11 is 0.1mm; The thickness of DVD discs is 1.2mm, and the distance on data Layer 33 and surface 31 is 0.6mm; The thickness of CD discs is 1.2mm, and the distance on data Layer 53 and surface 51 is 1.2mm.

Because in the optical read head, the operating distance of blue laser light source (working distance) only has 0.5mm, and so-called operating distance is the distance that blue laser light source focus can move up and down.Therefore, shown in Figure 1B, utilize the blue laser light-resource fousing to move in the Blu-ray Disc sheet and between operating distance, can produce two reflected signals (reflection signal), first reflected signal 81 is that surface 11 reflection by the Blu-ray Disc sheet is produced, second reflected signal 82 be the data Layer 13 by the Blu-ray Disc sheet reflect produced.

When the blue laser light-resource fousing moves in the DVD discs and between operating distance, only can produce a reflected signal (reflection signal) 83.Because the data Layer 33 of DVD discs is 0.6mm with the distance on surface 31, so reflected light signal 83 is that surface 31 reflections by the DVD discs are produced.That is, the focus of blue laser light source can't arrive the data Layer 33 of DVD discs and can't produce other reflected signal.In like manner, the CD discs also only can produce a reflected signal.

Therefore, can determine that discs is to belong to low packing density discs (CD discs, DVD discs) or high data density discs (Blu-ray Disc sheet) according to the number of reflected signal.

Please refer to Fig. 2 A, Fig. 2 B and Fig. 2 C, Fig. 2 A, Fig. 2 B and Fig. 2 C are second kind of synoptic diagram of distinguishing low packing density discs and high data density discs in the prior art.This method is disclosed in the file that U.S. Patent Publication No. is US2004/0240357.This method is utilized different photodetectors, and (photodetector PD) has the characteristic of different sensitivity (sensitivity) to judge the kind of discs to various wavelength.

Fig. 2 A is the optical read head of blu-ray drives, comprising: CD LASER Light Source 101, CD photodetector (PD for CDs) 104, DVD LASER Light Source 102, DVD photodetector (PD for DVDs) 105, HD DVD LASER Light Source 103, HD DVD photodetector (PD for HD DVDS) 106 and a plurality of optical module (optical element).

Briefly, the light that CD LASER Light Source 101 is launched (beam) can arrive discs 122 afterwards through optical module, and the light of reflection can pass through optical module once more and be received by CD photodetector 104.And reflection ray is except being received by CD photodetector 104, and the reflection ray of part also can be received by DVD photodetector 105 and HD DVD photodetector 106.In like manner, the light of arbitrary LASER Light Source emission, its reflection ray all can be received by CD photodetector 104, DVD photodetector 105 and HD DVD photodetector 106.That is to say, after discs is inserted CD-ROM drive, this method is the light (beam) that utilizes CD LASER Light Source 101 to launch according to establishing to discs, and the reflection ray that is received according to CD photodetector 104 and HD DVD photodetector 106 and corresponding signal thereof the type of judging discs.

Please refer to Fig. 2 B, Fig. 2 B is the discs the inserted corresponding signal schematic representation when being the CD discs.After the CD discs is inserted CD-ROM drive, CD LASER Light Source 101 emission light and focus driver (focus drive) moves forward and backward the focus that (forward-reverse movement) controls light.When focus is passed through the data Layer of CD discs, CD photodetector 104 corresponding focus error signals (focusing error signal, be called for short FE) can produce a S curve (S-curve), track error signal (tracking error signal, being called for short TE) meeting produces a string ripple curve (sinusoid-curve), radiofrequency signal (radio frequency signal is called for short RF) can produce a peak value (peak).By among Fig. 2 B as can be known, the peak-to-peak value (peak-to-peakvalue) of S curve is fe1 in the CD photodetector 104 corresponding focus error signals (FE), the peak-to-peak value of string ripple curve is te1 in the track error signal (TE), and the peak value in the radiofrequency signal (RF) is rf1.

Simultaneously, when focus during through the data Layer of CD discs, HD DVD photodetector 106 corresponding focus error signals (FE) can produce that a S curve, track error signal (TE) can produce a string ripple curve, radiofrequency signal (RF) can produce a peak value.By among Fig. 2 B as can be known, the peak-to-peak value of S curve is fe2 in the HD DVD photodetector 106 corresponding focus error signals (FE), the peak-to-peak value of string ripple curve is te2 in the track error signal (TE), the peak value in the radiofrequency signal (RF) is rf2.Afterwards, relatively fe1 and fe2 or according to poor (difference) of above-mentioned numerical value or the relation of ratio (ratio) can judge that the CD discs inserts CD-ROM drive.

Please refer to Fig. 2 C, Fig. 2 C is the discs the inserted corresponding signal schematic representation when being HD DVD discs.After HD DVD discs is inserted CD-ROM drive, CD LASER Light Source 101 emission light and focus driver (focus drive) moves forward and backward the focus that (forward-reverse movement) controls light.When focus during through the data Layer of HD DVD discs, CD photodetector 104 corresponding focus error signals (FE) can produce that a S curve, track error signal (TE) can produce a string ripple curve, radiofrequency signal (RF) can produce a peak value.By among Fig. 2 C as can be known, the peak-to-peak value of S curve is fe3 in the focus error signal (FE), the peak-to-peak value of string ripple curve is te3 in the track error signal (TE), the peak value in the radiofrequency signal (RF) is rf3.

Simultaneously, when focus during through the data Layer of HD DVD discs, HD DVD photodetector 106 corresponding focus error signals (FE) can produce that a S curve, track error signal (TE) can produce a string ripple curve, radiofrequency signal (RF) can produce a peak value.By among Fig. 2 C as can be known, the peak-to-peak value of S curve is fe4 in the focus error signal (FE), the peak-to-peak value of string ripple curve is te4 in the track error signal (TE), the peak value in the radiofrequency signal (RF) is rf4.Afterwards, relatively fe3 and fe4 or according to poor (difference) of above-mentioned numerical value or the relation of ratio (ratio) can judge that HD DVD discs inserts CD-ROM drive.

Please refer to Fig. 3 A, Fig. 3 B, Fig. 3 C and Fig. 3 D, Fig. 3 A, Fig. 3 B, Fig. 3 C and Fig. 3 D are the third synoptic diagram of distinguishing low packing density discs and high data density discs in the prior art.This method is disclosed in the file that U.S. Patent Publication No. is US2007/0211587.This method utilizes the low density optical disc sheet different with the gauge (track pitch) between the high density compact disc sheet, and the blank CD characteristic different with the discs characteristic of record data judged the kind of discs.

Please refer to Fig. 3 A, Fig. 3 A is the track width synoptic diagram of DVD discs and HD DVD discs.As shown in Figure 3A, the gauge of DVD discs is all 0.74 μ m; The data field of HD DVD (data area) is different with the gauge of Lead-In Area (lead in area), and the gauge of Lead-In Area is 0.68 μ m, and the gauge of data field is 0.4 μ m.The single luminous point that the DVD LASER Light Source is produced (beam spot) can focus on the track of DVD discs; The single luminous point that the DVD LASER Light Source is produced also can focus on the track of HDDVD discs Lead-In Area.But the single luminous point that the DVD LASER Light Source is produced can focus on a plurality of tracks of HD DVD discs data field simultaneously.Be called phase difference detection track error signal (differentialphase detection tracking error signal is called for short DPD TE signal) and utilize single luminous point to focus on the discs formed track error signal.In general, when recording data on the track of discs, can produce DPD TE, when discs can't produce DPD TE during for blank CD.

Please refer to Fig. 3 B, Fig. 3 B is the track width synoptic diagram of DVD discs and HD DVD discs.Be called the differential track error signal (differential push pull tracking error signal is called for short DPP TE signal) of recommending and utilize a main luminous point (main beam spot) and formed three luminous points of two less important luminous points (sub-beam spot) to focus on the discs formed track error signal.In general, when recording data on the track of discs, DPP TE can be produced, when discs is blank CD, also DPP TE can be produced.

Please refer to Fig. 3 C, Fig. 3 C is the third process flow diagram of judging CD types in the prior art.After discs is inserted CD-ROM drive, utilize the DVD LASER Light Source to judge the kind of discs.Steps A 1 is one times of speed (DVD 1X speed) rotation with the speed setting of spindle in optical disc drive motor (spindle motor).Steps A 2 moves to the data field with optical read head.Steps A 3 waits for that Spindle Motor arrives one times of speed rotation.Steps A 4 is utilized DPD TE to measure the offset (eccentricity) of CD-ROM drive and is set at LDD.

Then, as steps A 5, relatively LDD and presets Ref (LDD).As LDD during, determine that then discs is the little DVD discs of record data and offset (steps A 6) less than Ref (LDD).Otherwise,, proceed the judgement (steps A 7) of HD DVD discs and DVD discs as LDD during greater than Ref (LDD).

Then, steps A 8 is utilized DPP TE to measure the offset of CD-ROM drive and is set at DP.Steps A 9 moves to Lead-In Area with optical read head.Steps A 10 is utilized DPP TE to measure the offset of CD-ROM drive and is set at SP.

Then, as steps A 11, compare SP and DP.As SP during near DP, then the representative data district is identical with the track width of Lead-In Area, judges that then discs is the big blank DVD discs (steps A 12) of offset.Otherwise, when SP keeps off DP, once more optical read head is moved to data field (steps A 13).

Then, as steps A 14, be two times of speed (DVD 2X speed) rotations with the speed setting of spindle in optical disc drive motor.Steps A 15 is utilized DPD TE to measure the offset of CD-ROM drive and is set at HDD.

Then, steps A 16, relatively HDD and LDD.As HDD during near LDD, then represent rotating speed can not influence offset, judge that then discs is the big DVD ROM discs (steps A 17) of offset.Otherwise, when HDD keeps off LDD, then represent rotating speed can influence offset, judge that then discs is HD DVD discs (steps A 18).

Please refer to Fig. 4 A and Fig. 4 B, Fig. 4 A and Fig. 4 B are the 4th kind of synoptic diagram of distinguishing low packing density discs and high data density discs in the prior art.This method is disclosed in the file that U.S. Patent Publication No. is US2001/0006211.This method utilizes coenvelope signal (upperenvelope signal) that DPP TE produced and lower envelope signal (lower envelope signal) to judge the kind of discs.

Wherein, Fig. 4 A is the coherent signal of HD DVD discs.Fig. 4 A is respectively the DPP TE of HD DVD discs from top to bottom, the coenvelope signal of DPP TE, the inversion signal of the lower envelope signal of DPP TE, the digital signal behind cutting (slice) coenvelope signal, and the digital signal behind the inversion signal of cutting coenvelope signal.By the digital signal of the inversion signal of the digital signal of coenvelope signal among Fig. 4 A and coenvelope signal as can be known, the phase place of these two digital signals is (identical) much at one, so this discs of decidable is a HD DVD discs.

Fig. 4 B is the coherent signal of DVD discs.Fig. 4 B is respectively the DPP TE of DVD discs from top to bottom, the coenvelope signal of DPP TE, the inversion signal of the lower envelope signal of DPP TE, the digital signal behind the cutting coenvelope signal, and the digital signal behind the inversion signal of cutting coenvelope signal.By the digital signal of the inversion signal of the digital signal of coenvelope signal among Fig. 4 B and coenvelope signal as can be known, the phase place of these two digital signals differs 90 degree approximately, so this discs of decidable is the DVD discs.

Please refer to Fig. 5 A～Fig. 5 D, Fig. 5 A～Fig. 5 D is the 5th kind of synoptic diagram of distinguishing low packing density discs and high data density discs in the prior art.This method is disclosed in the file that U.S. Patent Publication No. is US2006/0239160.This method utilization focuses on carries out track search (track search) when searching (focus search), and hands over more (track zero crossing) signal to judge the kind of discs according to track signal (TE) and zero.

The action of optical read head when wherein, Fig. 5 A searches for focusing on.By Fig. 5 A as can be known, when focusing on search, optical read head can move on perpendicular to the direction of discs.That is, move to position b, move near the position c of discs, move to position d by position c by position b away from discs by position a.

The action of optical read head when Fig. 5 B is the track search.By Fig. 5 B as can be known, when track was searched, optical read head can move being parallel on the direction of discs.That is, move to position f, move to position g, move to position h by position g by position f by position e.

After CD-ROM drive is inserted discs, utilize the blue laser light source irradiation also to focus on simultaneously and search and the track search in discs.Shown in Fig. 5 C, when inserting discs, can produce the focus error signal (FE) and the track error signal (TE) of S curve simultaneously, and can become zero-crossing signal behind the cutting track error signal (TE).By Fig. 5 C as can be known, the wider width of zero-crossing signal is represented the track width broad, therefore judges that discs is the DVD discs.

Shown in Fig. 5 D, when inserting discs, can produce the focus error signal (FE) and the track error signal (TE) of S curve simultaneously, and can become zero-crossing signal behind the cutting track error signal (TE).By Fig. 5 D as can be known, the width of zero-crossing signal is narrower, represents track width narrower, therefore judges that discs is a HD DVD discs.

Please refer to Fig. 6 A～Fig. 6 I, Fig. 6 A～Fig. 6 I is the 6th kind of synoptic diagram of distinguishing low packing density discs and high data density discs in the prior art.This method is disclosed in the file that U.S. Patent Publication No. is US2008/0002548.DPD TE that this method is utilized DVD or CD LASER Light Source to shine to be produced in the different discs sheet and the difference of DPP TE are judged the kind of discs.

Wherein, Fig. 6 A and Fig. 6 B are respectively the DPD TE and the DPP TE of HD DVD discs.Fig. 6 C and Fig. 6 D are respectively the DPD TE and the DPP TE of blank DVD-R discs.Fig. 6 E and Fig. 6 F are respectively the DPD TE and the DPP TE of DVD-ROM discs.Fig. 6 G and Fig. 6 H are respectively the DPD TE and the DPP TE of the DVD-R discs of record data.

Utilize suitable default accurate (predetermined level) and the DPDTE of above-mentioned various discs and the kind that DPP TE promptly can judge discs.Please refer to Fig. 6 I, Fig. 6 I is the 6th kind of flow process of judging the kind of discs in the prior art.At first, on the discs of inserting, produce DPD TE and DPP TE (step S108).Then, judge the relation (step S110) of the DPD TE and the first default accurate position.When DPD TE presets accurate position more than or equal to first, execution in step S120; Otherwise, when DPD TE presets accurate position less than first, execution in step S112.

When step S112, judge the relation of the DPP TE and the second default accurate position.When DPP TE preset accurate position more than or equal to second, this discs was judged to be blank DVD-R discs (step S116); Otherwise when DPP TE preset accurate position less than second, this discs was judged to be HD DVD discs (step S114).

When step S120, judge the relation of DPP TE and the 3rd default accurate position.When DPP TE preset accurate position more than or equal to the 3rd, this discs was judged to be the DVD-R discs (step S126) of record data; Otherwise when DPP TE preset accurate position less than the 3rd, this discs was judged to be DVD-ROM discs (step S122).

The utilization that the method for above-mentioned differentiation low density optical disc and high density compact disc has different discs characteristics, distance as discs data layer and superficial layer, the utilization that has different optical detector different sensitivity to various wavelength, the difference of then utilizing the gauge between low density optical disc and the high density compact disc that has.But the calculation of complex of said method adopts the CD types discriminating gear cost of said method higher, and the time of carrying out the differentiation of low density optical disc and high density compact disc kind is longer, and the accuracy rate of resolution is not high yet.

Summary of the invention

The objective of the invention is to utilize radiofrequency signal (RF signal) to judge high data density discs and low packing density discs.

Therefore, the present invention proposes a kind of method of judging CD types, in order to differentiate a discs is high data density discs or low packing density discs, and this method comprises the following steps: that the luminous point that LASER Light Source is produced focuses on the discs, and rotates described discs; First signal that produces radiofrequency signal and be relevant to described radiofrequency signal, described first signal is according to the detected end envelope signal of described radiofrequency signal, or the coenvelope signal of described radiofrequency signal deducts the envelope difference signal that produces behind the lower envelope signal of this radiofrequency signal, and parameter value is the peak-to-peak value of described first signal or the count value that characterizes the described first signal frequency size; The parameter value of described first signal and the default value of setting are compared; And, when the parameter value of described first signal during, judge that described discs is the high data density discs less than described default value; Otherwise judge that described discs is low packing density discs.

The invention allows for a kind of device of judging CD types, comprising: Spindle Motor is used for carrying and rotary CD sheet; Optical read head produces a plurality of light signals after being used to launch LASER Light Source and focusing on described discs; Amplifier is used for combination and amplifies described a plurality of light signal generating radiofrequency signal; First signal detector, produce first signal that is relevant to described radiofrequency signal after being used to receive described radiofrequency signal, described first signal is according to the detected end envelope signal of described radiofrequency signal, or the coenvelope signal of described radiofrequency signal deducts the envelope difference signal that produces behind the lower envelope signal of this radiofrequency signal; The size detection device is used for producing the parameter value of described first signal according to described first signal, and described parameter value is the peak-to-peak value of described first signal or the count value that characterizes the described first signal frequency size; Comparer is used for a described parameter value and a default value are compared, the output compare result signal; And, controller, be used for when judging that according to described compare result signal described discs is high data density discs or low packing density discs,, judge that described discs is the high data density discs when the parameter value of described first signal during less than described default value; Otherwise judge that described discs is low packing density discs.

The present invention proposes a kind of method of judging CD types again, in order to differentiate a discs is high data density discs or low packing density discs, this method comprises the following steps: that the luminous point that LASER Light Source is produced focuses on the discs, and rotates described discs; The end envelope signal that produces radiofrequency signal and be relevant to described radiofrequency signal; Detect the first peak peak value of described radiofrequency signal; Detect second peak-to-peak value of envelope signal of the described end; Described second peak-to-peak value divided by described first peak peak value, is obtained first ratio value; Described first ratio value and a preset ratio value are compared; And, when described first ratio value during, judge that described discs is the high data density discs less than described preset ratio value, otherwise, judge that described discs is low packing density discs.

The present invention is owing to directly utilized radiofrequency signal to judge that discs is high disc of low-density or high density compact disc sheet, and it calculates simple, processing ease.Use the judgment means of this method with low cost, judge that employed discs is that the shared time of low density optical disc or high density compact disc is short, the judging nicety rate height.And the present invention adopts the red laser light source as the LASER Light Source of judging that disc types adopted, because the wavelength of red laser light source is longer, it can carry out the judgement of disc types more accurately.The present invention adopts the end envelope signal of radiofrequency signal or envelope difference signal that the coenvelope signal deducts the lower envelope signal as the foundation of judging disc types, because above-mentioned two kinds of signals can better reflect the characteristic of different pieces of information disc density sheet, therefore calculating is more easy, and the accuracy rate of judgement is also higher.The present invention during less than described default value, judges that described discs is the high data density discs at the parameter value of described first signal; Otherwise judge that described discs is low packing density discs, therefore only need characteristic default settings according to the different pieces of information disc density, and can simply regulate default value as required and adjust the accuracy that judgment means of the present invention is judged disc types, it is easier to make apparatus of the present invention calculate, structure is simpler, thereby further reduces the time that disc types is judged.

Description of drawings

Figure 1A is that first kind of prior art distinguished in low packing density discs and the high data density discs scheme, and the data Layer of various discs thickness and various discs is to the synoptic diagram of surface distance.

Figure 1B is that first kind of prior art distinguished in low packing density discs and the high data density discs scheme, and the blue laser light-resource fousing is in the synoptic diagram of the Blu-ray Disc sheet and the reflected signal that produces.

Fig. 2 A is that second kind of prior art distinguished in low packing density discs and the high data density discs scheme optical read head synoptic diagram of blu-ray drives.

Fig. 2 B is that second kind of prior art distinguished in low packing density discs and the high data density discs scheme the corresponding signal schematic representation when inserting the CD discs.

Fig. 2 C is that second kind of prior art distinguished in low packing density discs and the high data density discs scheme the corresponding signal schematic representation when inserting HD DVD discs.

Fig. 3 A is in low packing density discs of the third differentiation of prior art and the high data density discs scheme, one of track width synoptic diagram of DVD discs and HD DVD discs.

Fig. 3 B is in low packing density discs of the third differentiation of prior art and the high data density discs scheme, one of track width synoptic diagram of DVD discs and HD DVD discs.

Fig. 3 C and Fig. 3 D are the method flow diagram of low packing density discs of the third differentiation of prior art and high data density discs.

Fig. 4 A is that the 4th kind of prior art distinguished in low packing density discs and the high data density discs scheme coherent signal synoptic diagram of HD DVD discs.

Fig. 4 B is that the 4th kind of prior art distinguished in low packing density discs and the high data density discs scheme coherent signal synoptic diagram of DVD discs.

Fig. 5 A is that the 5th kind of prior art distinguished in low packing density discs and the high data density discs scheme, focuses on the action synoptic diagram of optical read head when searching.

Fig. 5 B is that the 5th kind of prior art distinguished in low packing density discs and the high data density discs scheme action synoptic diagram of optical read head when track is searched.

Fig. 5 C is that the 5th kind of prior art distinguished in low packing density discs and the high data density discs scheme, inserts the synoptic diagram of DVD signal that discs produces.

Fig. 5 D is that the 5th kind of prior art distinguished in low packing density discs and the high data density discs scheme, inserts the synoptic diagram of HD-DVD signal that discs produces.

Fig. 6 A and Fig. 6 B are respectively the 6th kind of prior art and distinguish in low packing density discs and the high data density discs scheme, the DPD TE of HD DVD discs and the synoptic diagram of DPP TE.

Fig. 6 C and Fig. 6 D are respectively the 6th kind of prior art and distinguish in low packing density discs and the high data density discs scheme, the DPD TE of blank DVD-R discs and the synoptic diagram of DPP TE.

Fig. 6 E and Fig. 6 F are respectively the 6th kind of prior art and distinguish in low packing density discs and the high data density discs scheme, the DPD TE of DVD-ROM discs and the synoptic diagram of DPP TE.

Fig. 6 G and Fig. 6 H are respectively the 6th kind of prior art and distinguish in low packing density discs and the high data density discs scheme, the DPD TE of DVD-R discs and the synoptic diagram of DPP TE.

Fig. 6 I is that the 6th kind of prior art distinguished in low packing density discs and the high data density discs scheme, judges the method flow diagram of CD types.

Fig. 7 A is red laser light source irradiation formed radiofrequency signal synoptic diagram on low packing density discs in the embodiment of the invention.

Fig. 7 B is red laser light source irradiation formed radiofrequency signal synoptic diagram on the high data density discs in the embodiment of the invention.

Fig. 8 A is red laser light source irradiation formed radiofrequency signal (RF_ on low packing density discs in the embodiment of the invention _{L density}), end envelope signal (LE_ _{L density}) and frequency spectrum (spectrum) synoptic diagram of end envelope signal.

Fig. 8 B is red laser light source irradiation formed radiofrequency signal (RF_ on the high data density discs in the embodiment of the invention _{H density}), end envelope signal (LE_ _{H density}) and the spectrum diagram of end envelope signal.

Fig. 9 A is the apparatus structure synoptic diagram that first embodiment of the invention is judged the discs type.

Fig. 9 B is the method flow diagram that first embodiment of the invention is judged the discs type.

Figure 10 A is the apparatus structure synoptic diagram that second embodiment of the invention is judged the discs type.

Figure 10 B is the method flow diagram that second embodiment of the invention is judged the discs type.

Figure 11 judges the method flow diagram of discs type for third embodiment of the invention.

The primary clustering symbol description:

11,31,51 top layers, 13,33,53 data Layers

81 first reflected signals, 82 second reflected signals

83 reflected signals, 101 CD LASER Light Source

102 DVD LASER Light Source, 103 HD DVD LASER Light Source

104 CD photodetectors, 105 DVD photodetectors

106 HD DVD photodetectors, 122 discs

901 Spindle Motors, 903 optical read heads

905 big device 907 end envelope detectors

909 size detection devices, 911 comparers

913 controllers, 915 motor drivers

920 discs, 940 frequency detectors

942 bandpass filter, 944 cutter units

946 counters

Embodiment

Because traditional CD discs and DVD discs are to belong to low packing density discs, and Blu-ray Disc sheet and HD DVD discs are to belong to the high data density discs.In general, in the low packing density discs data field track width of DVD discs the narrowest be 0.740 μ m; The data field track width of blue light discs and HD DVD discs is 0.40 μ m in the high data density discs.

According to embodiments of the invention, utilize the discs of judging in desire such as the red laser light source irradiation of CD LASER Light Source or DVD LASER Light Source, and utilize the radiofrequency signal (RF signal) that produces promptly can carry out the judgement of discs.

Please refer to Fig. 7 A, Fig. 7 A is the synoptic diagram of red laser light source irradiation in low packing density discs and formed radiofrequency signal.Because luminous point (beam spot) diameter that the red laser light source is produced is about 0.65 μ m, this luminous point can be aimed at the single track of DVD discs or CD discs smoothly.And luminous point when mobile, can not expose to a plurality of tracks simultaneously, thereby can produce the stronger radiofrequency signal of signal between track.

Please refer to Fig. 7 B, Fig. 7 B is red laser light source irradiation formed radiofrequency signal on the high data density discs.Because the luminous point that the red laser light source is produced can shine a plurality of tracks in the high data density discs simultaneously.Therefore, luminous point between track when mobile, the radiofrequency signal that can produce cross-talk phenomenon (cross talk) and can make generation a little less than.

Please refer to Fig. 8 A, be respectively red laser light source irradiation formed radiofrequency signal (RF_ on low packing density discs among Fig. 8 A from top to bottom _{L density}), end envelope signal (LE_ _{L density}) and the frequency spectrum (spectrum) of end envelope signal.By among Fig. 8 A as can be known, end envelope signal (LE_ _{L density}) peak-to-peak value (peak to peak value) greater than default value (Vm), and by the spectrogram envelope signal (LE_ that can know the inside story _Ldensity) frequency range between 0～8000Hz.

Please refer to Fig. 8 B, be respectively red laser light source irradiation formed radiofrequency signal (RF_ on the high data density discs among Fig. 8 B from top to bottom _{H density}), end envelope signal (LE_ _{H density}) and the frequency spectrum of end envelope signal.By among Fig. 8 B as can be known, end envelope signal (LE_ _{H density}) peak-to-peak value less than default value (Vm), and by the spectrogram envelope signal (LE_ that can know the inside story _{H density}) frequency range between 0～1000Hz.

Utilize above-mentioned characteristic, the present invention can determine that discs is low packing density discs or high data density discs according to the peak-to-peak value or the frequency of end envelope signal.

Please refer to Fig. 9 A and Fig. 9 B, Fig. 9 A and Fig. 9 B are respectively the apparatus structure synoptic diagram and the method flow diagram of judging the discs type that first embodiment of the invention is judged the discs type.Shown in Fig. 9 A, this device comprises: a Spindle Motor 901, optical read head 903, amplifier (amplifier) 905, end envelope detector (lower envelop detector) 907, size detection device (magnitude detector) 909, comparer (comparator) 911, controller (controller) 913 and motor driver (motor driver) 915.

Wherein, controller 913 can produce drive signal to motor driver 915, and in order to 901 rotations of control Spindle Motor, and 903 pairs of discs 920 of control optical read head focus on moving of (focusing), lock rail (tracking).Optical read head 903 can produce a plurality of light signals (optical signals) to amplifier 905.Amplifier 905 can in conjunction with and amplify these light signals and become a radiofrequency signal (RF signal), be sent to end envelope detector 907 then.End envelope detector 907 is in order to produce end envelope signal (LE signal) according to described radiofrequency signal.And size detection device 909 produces the peak-to-peak value (peak to peak value) of end envelope signal to comparer 911 after receiving end envelope signal.Comparer 911 is relatively behind this peak-to-peak value and the default value (Vm) that provided by controller 913, compare result signal is delivered to controller 913, and controller 913 can judge that discs 920 is low packing density discs or high data density discs according to this compare result signal.

Shown in Fig. 9 B, this method comprises the following steps: at first, opens red laser light source and rotary CD sheet (step 922).The luminous point that the red laser light source is produced focuses on (step 924) on the discs.Produce RF signal and end envelope signal (step 926) thereof.Then, the peak-to-peak value and the default value (Vm) (step 928) that compare end envelope signal; When the peak-to-peak value of end envelope signal during, judge that discs is a high data density discs (step 930) less than default value (Vm); Otherwise,, judge that discs is low packing density discs (step 932) when the peak-to-peak value of end envelope signal during greater than default value (Vm).

Please refer to Figure 10 A and Figure 10 B, Figure 10 A and Figure 10 B are respectively the apparatus structure synoptic diagram and the method flow diagram of judging the discs type that second embodiment of the invention is judged the discs type.Shown in Figure 10 A, this device comprises: a Spindle Motor 901, optical read head 903, amplifier 905, end envelope detector 907, frequency detector (frequency detector) 940, comparer 911, controller 913 and motor driver 915.Wherein, frequency detector 940 specifically comprise a bandpass filter (band-passfilter) 942, a cutting unit (slicing unit) 944, with a counter (counter) 946.

Wherein, controller 913 can produce drive signal to motor driver 915, and in order to 901 rotations of control Spindle Motor, and 903 pairs of discs 920 of control optical read head focus on moving of (focusing), lock rail (tracking).Optical read head 903 can produce a plurality of light signals (optical signals) to amplifier 905.Amplifier 905 can in conjunction with and amplify those light signals and become a radiofrequency signal (RF signal), be sent to end envelope detector 907 then.End envelope detector 907 is in order to produce end envelope signal (LE signal) according to described radiofrequency signal.And frequency detector 940 produces a count value of this end envelope signal to comparer 911 after receiving end envelope signal.After the pre-set count values (Vf) that comparer 911 is provided in order to this count value relatively and by controller 913, and then compare result signal is delivered to controller 913 judge that discs 920 is low packing density discs or high data density discs.Wherein, the end envelope signal (filtered lower envelop signal) that can produce filtration after the bandpass filter 942 in the end envelope signal process frequency detector 940 is to cutter unit 944, and the end envelope signal cutting that cutter unit 944 can filter form pulse (pulse) signal to counter 946 afterwards.And counter 946 promptly can calculate the pulse number of pulse signal and become count value.That is to say that the end envelope signal of the filtration that frequency is higher has higher count value; Otherwise the end envelope signal of the filtration that frequency is lower has lower count value.As seen, count value is to characterize end envelope signal frequency size.

Shown in Figure 10 B, this method comprises the following steps: at first, opens red laser light source and rotary CD sheet (step 952).The luminous point that the red laser light source is produced focuses on (step 954) on the discs.Produce RF signal and end envelope signal (step 956) thereof.Obtain the count value (step 958) that characterizes end envelope signal frequency size.Then, compare a count value and a pre-set count values (Vf) (step 960); When count value during, judge that discs is a high data density discs (step 962) less than pre-set count values (Vf); Otherwise,, judge that discs is low packing density discs (step 964) when count value during greater than pre-set count values (Vf).

According to first and second embodiment of the present invention, except utilizing the lower envelope signal judges, technician in the CD-ROM drive field also can deduct the coenvelope signal (upper envelop signal) of RF signal lower envelope signal (lower envelop signal) back and produce an envelope difference signal (envelopdifference signal), and utilize the peak-to-peak value of envelope difference signal or frequency to judge also can to obtain identical judged result, the present invention repeats no more.

Referring again to Fig. 8 A and Fig. 8 B, the present invention can also be according to the peak-to-peak value (VPP_ of radiofrequency signal _RF) with the peak-to-peak value (VPP_ of end envelope signal _LE) ratio judge discs.

Please refer to Figure 11, Figure 11 judges the method for discs type for third embodiment of the invention.This method comprises the following steps: at first, opens red laser light source and rotary CD sheet (step 982).The luminous point that the red laser light source is produced focuses on (step 984) on the discs.Produce RF signal and end envelope signal (step 986) thereof.Detect the peak-to-peak value (VPP_ of RF signal _RF) and the peak-to-peak value (VPP_ that produced of end envelope signal _LE) (step 988).Then, compare VPP_ _LE/ VPP_ _RFWith a preset ratio value (Vr) (step 990); Work as VPP_ _LE/ VPP_ _RFDuring less than preset ratio numerical value (Vr), judge that discs is a high data density discs (step 992); Otherwise, work as VPP_ _LE/ VPP_ _RFDuring greater than preset ratio value (Vr), judge that discs is low packing density discs (step 994).

In general, the VPP_ of low packing density discs _LE/ VPP_ _RFBe about 60%; And the VPP_ of high data density discs _LE/ VPP_ _RFBe about 20%.Therefore, preset ratio value (Vr) can be set for example is 30% reference as low packing density discs of judgement or high data density discs.

In sum, more than be preferred embodiment of the present invention only, be not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. a method of judging CD types is high data density discs or low packing density discs in order to differentiate a discs, it is characterized in that this method comprises the following steps:

The luminous point that LASER Light Source produced is focused on the discs, and rotate described discs;

First signal that produces radiofrequency signal and be relevant to described radiofrequency signal, described first signal is according to the detected end envelope signal of described radiofrequency signal, or the coenvelope signal of described radiofrequency signal deducts the envelope difference signal that produces behind the lower envelope signal of this radiofrequency signal, and parameter value is the peak-to-peak value of described first signal or the count value that characterizes the described first signal frequency size;

The parameter value of described first signal and the default value of setting are compared; And,

When the parameter value of described first signal during, judge that described discs is the high data density discs less than described default value; Otherwise judge that described discs is low packing density discs.

2. the method for judgement CD types as claimed in claim 1 is characterized in that, described LASER Light Source is the red laser light source.

3. the method for judgement CD types as claimed in claim 1 is characterized in that, the operation of obtaining of the count value of the described first signal frequency size of described sign comprises the following steps:

Produce first signal that filters after filtering described first signal;

Form pulse signal after cutting first signal of described filtration; And

With the pulse number of described pulse signal as described count value.

4. a device of judging CD types is characterized in that, this device comprises:

Spindle Motor is used for carrying and rotary CD sheet;

Optical read head produces a plurality of light signals after being used to launch LASER Light Source and focusing on described discs;

Amplifier is used for combination and amplifies described a plurality of light signal generating radiofrequency signal;

First signal detector, produce first signal that is relevant to described radiofrequency signal after being used to receive described radiofrequency signal, described first signal is according to the detected end envelope signal of described radiofrequency signal, or the coenvelope signal of described radiofrequency signal deducts the envelope difference signal that produces behind the lower envelope signal of this radiofrequency signal;

The size detection device is used for producing the parameter value of described first signal according to described first signal, and described parameter value is the peak-to-peak value of described first signal or the count value that characterizes the described first signal frequency size;

Comparer is used for a described parameter value and a default value are compared, the output compare result signal; And

Controller is used for when judging that according to described compare result signal described discs is high data density discs or low packing density discs, when the parameter value of described first signal during less than described default value, judges that described discs is the high data density discs; Otherwise judge that described discs is low packing density discs.

5. the device of judgement CD types as claimed in claim 4 is characterized in that, described LASER Light Source is the red laser light source.

6. the device of judgement CD types as claimed in claim 4 is characterized in that, the described described size detection device that is used to detect the count value that characterizes the described first signal frequency size comprises:

Bandpass filter produces first signal that filters after being used to filter described first signal;

Cutter unit forms pulse signal after being used to cut first signal of described filtration; And

Counter can be counted the pulse number of described pulse signal, obtains described count value.

7. a method of judging CD types is high data density discs or low packing density discs in order to differentiate a discs, it is characterized in that this method comprises the following steps:

The end envelope signal that produces radiofrequency signal and be relevant to described radiofrequency signal;

Detect the first peak peak value of described radiofrequency signal;

Detect second peak-to-peak value of envelope signal of the described end;

Described second peak-to-peak value divided by described first peak peak value, is obtained first ratio value;

Described first ratio value and a preset ratio value are compared; And,

When described first ratio value during less than described preset ratio value, judge that described discs is the high data density discs, otherwise, judge that described discs is low packing density discs.

8. the method for judgement CD types as claimed in claim 7 is characterized in that, described LASER Light Source is the red laser light source.